. >> as long as i'm president of the united states, iran will not get a nuclear weapon. i made that clear when i came into office. >> china, iran, latin america, mala, those are some of the countries discussed at monday's third debate. the question is, why. i asked richard quest, host of "quest means business." how either candidate can have an effect on the u.s. economy without dealing with europe. >> they are powerless to do anything about it. there is a reason they haven't talked about it in the debates or it's not an a issue in the campaign. they can't do anything about it. they can conjoel and berate and have some influence, but the euro zone and the european union is a trading block just almost as big as the united states. it has more people in it. so, president obama and certainly we know from tim geithner, the treasury secretary who continually beats them over the head for europeans to do something. but they are powerless. they have to stand and watch. >> so, we know that over the last four years the president's tried this diplomacy with europe. has it worked? you